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Tungsten trioxide nano bowl electrochromic material and preparation method thereof

An electrochromic material, tungsten trioxide technology, applied in coatings and other directions, can solve the problems of optical contrast, response time cycle stability, unsatisfactory electrochromic performance indicators, chemical stability, poor cycle life, limited ion transmission capacity, etc. problems, to achieve the effect of improving electron transport speed and particle diffusion rate, excellent cycle stability, and improving electrochromic performance

Active Publication Date: 2019-04-19
合肥庐阳科技创新集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, optical contrast, response time, cycling stability, and some other electrochromic performance indicators are still unsatisfactory, especially for bulk WO. 3 For the compact structure, the ion transport capacity is limited
It is well known that the degree of crystallinity in WO 3 plays a crucial role in the electrochromic properties of the amorphous WO 3 In general, its large capacity for small ions means high optical modulation capability, and its multi-type transport channels and thermally induced defects associated with oxygen vacancies ensure a high ion diffusion coefficient, making color switching fast, but its sub- Steady-state structure and poor chemical stability lead to poor cycle life
On the other hand, crystalline WO 3 It has high electrical conductivity and stable microstructure, which makes it have good chemical stability and structural stability, but its dense structure leads to relatively low diffusion coefficient and relatively slow response speed

Method used

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  • Tungsten trioxide nano bowl electrochromic material and preparation method thereof
  • Tungsten trioxide nano bowl electrochromic material and preparation method thereof
  • Tungsten trioxide nano bowl electrochromic material and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a preparation method of the tungsten trioxide nanobowl electrochromic material described in the above technical solution, comprising the following steps:

[0036] Mixing the polystyrene microsphere dispersion, ethanol and acetone to obtain a suspension;

[0037] Put water and FTO conductive glass into a petri dish, drop the suspension and triton into the water surface in turn, then take out the FTO conductive glass, and dry it naturally to obtain FTO conductive glass wrapped by a single-layer PS sphere film;

[0038] Na 2 WO 4 Powder, H 2 o 2 After the solutions are mixed, the pH value is adjusted to 1.0-2.0 with perchloric acid to obtain an electrolyte solution;

[0039] The FTO conductive glass wrapped by the single-layer PS spherical film is used as the working electrode, the platinum wire is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode, and the working electrode is pulse-deposited...

Embodiment 1

[0057] (1) Place the FTO conductive glass in acetone, ethanol, and deionized water for ultrasonic cleaning in sequence, and dry it in a vacuum oven after cleaning.

[0058] (2) Mix PS sphere dispersion with a diameter of 500nm (8% concentration, dispersed in deionized water) with ethanol and acetone at a ratio of 5:5:2, ultrasonically disperse to form a milky white suspension, take a clean culture Fill the dish with deionized water and cleaned FTO conductive glass, take a little of the above milky white suspension and drop it on the deionized surface under the guidance of the glass slide, and drop a few drops of Triton diluted 100 times on the deionized water On the surface, a single layer of dense PS sphere film is formed, and then the FTO conductive glass is pulled out, and after natural drying, a single layer of PS sphere film is formed.

[0059] (3) Na under magnetic stirring 2 WO 4 Powder dissolved in 0.4wt% H 2 o 2 solution, forming 12.5mM H 2 WO 4 The solution was...

Embodiment 2

[0066] A preparation method of a tungsten trioxide nanobowl electrochromic material, the specific steps are as follows:

[0067] (1) Place the FTO conductive glass in acetone, ethanol, and deionized water for ultrasonic cleaning in sequence, and dry it in a vacuum oven after cleaning.

[0068] (2) Mix PS sphere dispersion with a diameter of 500nm (8% concentration, dispersed in deionized water) with ethanol and acetone at a ratio of 5:5:2, ultrasonically disperse to form a milky white suspension, take a clean culture Fill the dish with deionized water and cleaned FTO conductive glass, take a little of the above milky white suspension and drop it on the deionized surface under the guidance of the glass slide, and drop a few drops of Triton diluted 100 times on the deionized water On the surface, a single layer of dense PS sphere film is formed, and then the FTO conductive glass is pulled out, and naturally dried in the air to form a single layer of PS sphere film.

[0069] (3)...

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Abstract

The invention provides a tungsten trioxide nano bowl electrochromic material and a preparation method thereof, and belongs to the technical field of electrochromic films. The electrochromic material has a hierarchical porous structure, the tungsten trioxide nano bowl electrochromic material takes FTO conductive glass as a substrate, the surface of the substrate sequentially wraps a bottom layer and an outer layer, crystalline tungsten trioxide is used as the bottom layer, and amorphous tungsten trioxide is used as the outer layer, the outer layer is in a porous structure and comprises independent dispersed micro-region crystalline structures, and tungsten trioxide crystal nuclei with the diameter of 2-5 nm are distributed on the outer layer. According to the tungsten trioxide nano bowl electrochromic material and the preparation method thereof, the combination of crystalline and amorphous tungsten trioxide on a nano scale is achieved, the electrochromic performance is greatly improved,complementary advantages are achieved, the specific surface area of the nano bowl electrochromic material is increased, the kinetic process of the electrochromic reaction is obviously enhanced, so that the electrochromic performance is improved.

Description

technical field [0001] The invention relates to the technical field of electrochromic thin films, in particular to a tungsten trioxide nanobowl electrochromic material and a preparation method thereof. Background technique [0002] Electrochromic materials have attracted much attention due to their tunable and reversible modulation of optical properties (transmittance, absorbance, or reflectance) driven by low voltages, and are promising materials for energy-saving applications. WO 3 The electrochromic material has received extensive attention because it consists of a three-dimensional network of WO 6 The octahedral composition, which can provide abundant channels for transporting small ions, facilitates switchable color changes, and is also suitable for outdoor applications due to good environmental stability. However, so far, optical contrast, response time, cycling stability, and some other electrochromic performance indicators are still unsatisfactory, especially for b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34C03C17/25C03C17/245
CPCC03C17/006C03C17/245C03C17/25C03C17/3417C03C2217/425C03C2217/70C03C2217/94C03C2218/115C03C2218/155
Inventor 张勇史英迪汤凯宋艳斌崔接武王岩秦永强舒霞吴玉程
Owner 合肥庐阳科技创新集团有限公司
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